73K224BL

更新时间： 2024-01-08 21:36:58

品牌	Logo	应用领域
TERIDIAN		调制解调器
页数	文件大小	规格书
33页	202K
描述
Single-Chip Modem w/ Integrated Hybrid

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73K224BL 技术参数

生命周期：	Obsolete	零件包装代码：	DIP
包装说明：	DIP,	针数：	22
Reach Compliance Code：	unknown	HTS代码：	8542.39.00.01
风险等级：	5.04	其他特性：	FULL DUPLEX
数据速率：	2.4 Mbps	JESD-30 代码：	R-PDIP-T22
长度：	27.686 mm	功能数量：	1
端子数量：	22	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	DIP	封装形状：	RECTANGULAR
封装形式：	IN-LINE	认证状态：	Not Qualified
座面最大高度：	5.08 mm	标称供电电压：	5 V
表面贴装：	NO	电信集成电路类型：	MODEM
温度等级：	INDUSTRIAL	端子形式：	THROUGH-HOLE
端子节距：	2.54 mm	端子位置：	DUAL
宽度：	10.16 mm	Base Number Matches：	1

73K224BL 数据手册

73K224BL

V.22bis, V.22, V.21, Bell 212A, 103

Single-Chip Modem w/ Integrated Hybrid

DATA SHEET

DESIGN CONSIDERATIONS

APPLICATIONS INFORMATION (continued)

Semiconductor's one-chip modem products

include all basic modem functions. This makes

these devices adaptable for use in a variety of

applications, and as easy to control as

conventional digital bus peripherals.

DIRECT ACCESS ARRANGEMENT (DAA)

The DAA (Direct Access Arrangement) required for the

73K224BL consists of an impedance matching

resistor, telecom coupling transformer, and ring

detection and fault protection circuitry.

Unlike digital logic circuitry, modem designs must

properly contend with precise frequency

tolerances and very low level analog signals, to

ensure acceptable performance. Using good

analog circuit design practices will generally result

in a sound design. Following are additional

recommendations, which should be taken into

consideration when starting new designs.

The transformer specifications must comply with the

impedance of the country in which the modem is being

operated. Transformers designed specifically for use

with the telephone network should be used. These

may present a DC load to the network themselves (a

“wet” transformer) or they may require AC coupling

with a DC load provided by additional devices (a “dry”

transformer). A dry transformer will generally provide

higher performance and smaller size than a wet

transformer. A wet transformer allows a simpler

design, but must not saturate with the worst case DC

current passing through it or distortion and poor

performance will result.

CRYSTAL OSCILLATOR

The K-Series crystal oscillator requires a parallel

mode (anti-resonant) crystal, which operates at

11.0592 MHz. It is important that this frequency be

maintained to within ±0.01% accuracy.

The protection circuitry typically consists of a transient

suppression device and current limiter to protect the

user and the telephone network from hazardous

voltages that can be present under fault conditions.

The transient suppresser may be a MOV (metal oxide

In order for a parallel mode crystal to operate

correctly and to specification, it must have a

capacitor connected to the junction of each of the

crystal and internal inverter connections,

terminated to ground. The values of these

capacitors depend primarily on the crystal’s

characteristics, and to a lesser degree on the

internal inverter circuit. The values used affect the

accuracy and start up characteristics of the

oscillator.

varistor), Sidactor (Teccor Electronics Inc.), spark

gap device, or avalanche diode. Some devices clamp

the transient to their specified break down voltage and

others go into low impedance crowbar state. The latter

require that the fault current cease before they can

return to their inactive state.

LAYOUT CONSIDERATIONS

Current limiting devices can consist of a resistor,

Raychem PolySwitch resettable fuse, or slow blow

Good analog/digital design rules must be used to

control system noise in order to obtain highest

performance in modem designs. The more digital

circuitry present on the PC board, the more this

attention to noise control is needed. The modem

should be treated as a high performance analog

device. A 22 µF electrolytic capacitor in parallel

with a 0.1 µF ceramic capacitor between VDD and

GND is recommended. Liberal use of ground

planes and larger traces on power and ground are

also highly favored. High speed digital circuits tend

to generate a significant amount of EMI (Electro-

Magnetic Interference), which must be minimized

in order to meet regulatory agency limitations. To

accomplish this, high speed digital devices should

be locally bypassed, and the telephone line

interface and K-Series device should be located

close to each other near the area of the board

where the phone line connection is accessed. To

fuse that can withstand the transient tests without

permanent damage or replacement.

Ring detection circuitry is not required by the FCC, but

may be required by the application. The ring detector

usually consists of an optoisolator, capacitor, and

resistor to present the proper AC load to the network

to meet the REN (Ring Equivalency Number)

regulations of FCC Part 68. The K-Series Design

Manual contains detailed information on the design of

a ring detect circuits as well as the other topics

concerning the DAA.

Page: 29 of 33

Rev 7.1

1...26 27 282930 31 32 33

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与73K224BL相关器件

型号	品牌	获取价格	描述	数据表
73K224BL-32IH	TDK	获取价格	Modem, 2.4kbps Data, PQCC32, PLASTIC, LCC-32
73K224BL-IGT	ETC	获取价格	Single-Chip Modem w/ Integrated Hybrid
73K224BL-IH	ETC	获取价格	Single-Chip Modem w/ Integrated Hybrid
73K224BL-IH/F	TERIDIAN	获取价格	Single-Chip Modem w/ Integrated Hybrid
73K224BL-IHR/F	TERIDIAN	获取价格	Single-Chip Modem w/ Integrated Hybrid
73K224L	TERIDIAN	获取价格	Single-Chip Modem
73K224L	TDK	获取价格	V.22bis/V.22/V.21/ Bell 212A/Bell 103 Single-Chip Modem
73K224L-28IH	TDK	获取价格	V.22bis/V.22/V.21/ Bell 212A/Bell 103 Single-Chip Modem
73K224L-28IH	SST	获取价格	Modem, 2.4kbps Data, PQCC28
73K224L-28IH/F	TERIDIAN	获取价格	Single-Chip Modem

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